Estimations of Precipitable Water and Its Characteristics during the HUBEX/IOP 1998  

1998年淮河试验加密观测期间大气可降水的估算及其特征分析(英)

作　　者：姚展予 许晨海 袁健 李万彪 朱元竞 赵柏林 

机构地区：[1]Chinese Academy of Meteorological Sciences [2]Department of Atmospheric Sciences, School of Physics

出　　处：《Advances in Atmospheric Sciences》2003年第2期219-226,共8页大气科学进展（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under the Grant No. 49794030, the National Key Program of Science and Technology of China (2001BA610A-06-05), and the Science Foundation of the China Meteorological Administrat

摘　　要：GMS-5 satellite data at channels of infrared split windows and water vapor are analyzed to retrieve the precipitable water (PW) distributions under cloud-free conditions. Radiosonde data and surface station data are applied to estimate the PW distributions under cloudy conditions. These two methods are then merged to obtain the PW distributions under all-weather conditions during the Huaihe River Basin Energy and Water Cycle Experiment (HUBEX). The results of the all-weather PW distributions from these methods demonstrate that this new merging technique may be applied to derive large-scale or global maps of PW. It is revealed that the atmospheric water vapor over the Yangtze-Huaihe River Basins came mainly from the southwest during the 1998 prevailing period of Meiyu. Sufficient atmospheric PW is a necessary condition for ground rainfall. Under certain dynamic conditions, it can be partially transformed into surface precipitation. Several types of rain are displayed and their PW conditions and characteristics, as well as atmospheric dynamic conditions, are analyzed. It is demonstrated that surface precipitation centers usually appear not at the high PW centers but on their downwind sides.GMS-5 satellite data at channels of infrared split windows and water vapor are analyzed to retrieve the precipitable water (PW) distributions under cloud-free conditions. Radiosonde data and surface station data are applied to estimate the PW distributions under cloudy conditions. These two methods are then merged to obtain the PW distributions under all-weather conditions during the Huaihe River Basin Energy and Water Cycle Experiment (HUBEX). The results of the all-weather PW distributions from these methods demonstrate that this new merging technique may be applied to derive large-scale or global maps of PW. It is revealed that the atmospheric water vapor over the Yangtze-Huaihe River Basins came mainly from the southwest during the 1998 prevailing period of Meiyu. Sufficient atmospheric PW is a necessary condition for ground rainfall. Under certain dynamic conditions, it can be partially transformed into surface precipitation. Several types of rain are displayed and their PW conditions and characteristics, as well as atmospheric dynamic conditions, are analyzed. It is demonstrated that surface precipitation centers usually appear not at the high PW centers but on their downwind sides.

关 键 词：precipitable water estimation technique all-weather condition characteristic analysis 

分 类 号：P412[天文地球—大气科学及气象学]